The fifth national Armed Forces Day will begin today with an artillery regiment firing a volley of gun blasts at Nottingham Castle.
Further celebrations are planned across the UK.
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A video aimed at persuading "the youth" to vote in the EU referendum appears to have misfired, it was lambasted on Twitter.
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Pro-EU group admits it is behind 15-foot high graffiti which echoes a famous anti-Soviet artwork painted on the Berlin wall.